Which DDR4 to buy?

I just bought Aspire XC-885, it come with 8G DDR4 RAM. I realize that it is not enough to run simulation. I would like to upgrade for another 8G DDR4 RAM but I'm not sure how many different model, feature or interface out there in the market. Could anyone recommend which DDR4 will run together smoothly with my current 8G DDR4 RAM? Thank you

ACE Trailblazer 2014 - 2019

I would recommend the Kingston memory in link below. If your existing memory is 2666 CL=19, the Kingston memory in link below will work fine with your existing memory. If your existing memory is 2400 CL=17, the Kingston memory in link below will clock down to 2400 CL=17 and work fine with your existing memory. Bottom line---the Kingston memory in link below will work fine with your computer and existing memory.